Dipole Component in the Yrast Cascade and the Multiplicity of Statistical gamma -Rays

摘要

The quasi-continuum gamma-rays following ( exp 16 O,xn) reactions leading to the residual nuclei exp 162 Yb, exp 166 Yb, exp 134 Ce and exp 122 Xe by the gamma - gamma coincidence technique have been studied. In all cases studied, a dipole component was seen in the continuum spectra below approx. 400 keV; it was particularly large in the exp 134 Ce case. This component can be understood in terms of a simple model proposed previously. The average number of statistical gamma -rays increases with increasing input angular momentum. This can be understood in terms of a corresponding increase of average excitation energy for gamma -emission above the yrast line. (Atomindex citation 12:601466)